[Waedawen]

What's interesting about heal agro is that I think there's a flat modifier on the spells themselves and a modifier on the 'amount healed' (for direct heals) and then 'heal buffs' are in an entirely separate category

A warrior facepulls a mob with zero threat and he's at 100% hp. A minor heal will still steal agro away from him, even though the minor heal healed nothing. If he's at 70%, but swung at the mob 1 time, a minor heal will heal him, and hit him, but the mob will not change focus. One warrior swing is more threat than one minor heal. However, with one greater heal, the flat heal modifier + the amount of damage healed, indicates that After One melee swing, restorting 30% hit points on the tank will take agro off him.

I don't know how it -exactly- works with regeneration spells, but it seems that since they're buff-oriented, they are all worth the same value. Even though regrowth heals 3 thousand something hp, it seems Regeneration is just as handy for being an extremely heady dose of agro for minimal mana. I don't know how this works on v2 Regen spells, because I've never seen a Shaman or a Cleric 'acquire' agro during the Ticks of their heal, but I could easily be mistaken. I think that since it's 'buff-style' the only dose of agro is the Buff, then the 'points of healing' don't matter.